Sirmium

Sirmium

Emperor August first invaded Illyricum in 35 BC, but Romans stabilized themselves in Sirmium only with Emperor Tiberius during his Pannonia Wars around 10 BC. Roman castrum was built on the River Sava and this is probably the reason why the city that later grew around castrum was called Sirmium which means: to flow, flowing river or wetland. As such, Ancient Roman Sirmium used to be a part of very complex system of Roman strongholds allocated down Sava and Danube rivers to prevent potential Barbaric attacks coming from the North.